Clock



FIG. 1 is a perspective view of a clock incorporating the inventive design.

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a right view thereof; and,

FIG. 7 is a left view thereof. 

The ornamental design for a clock, as shown. 